Online Resources
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WEBDA
The best site for data and information on open clusters. Highly recommended!
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SIMBAD Astronomical Database
My favorite place to find data on any star
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The SAO/NASA Astrophysics Data System
The Digital Library for Physics and Astronomy
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ArXiv for Astrophysics
Thousands of articles on astrophysics, all downloadable
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The Washington Double Star Catalog
Favorite website used for identifying double stars and their individual components
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American Association of Variable Star Observers
Favorite website for everything about variable stars
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Revised New General Catalogue and Index Catalogue
The complete revised NGC
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Messier45
My favorite online deepsky database
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Stars
A website from James Kaler completely dedicated to Stars